鄂尔多斯盆地富县地区长8油层组致密油成藏主控因素分析

Abstract

Abstract:

Based on the massive analytical data of core, we comprehensively researched on the main controlling factors of the tight oil reservoir according to the property and the storage space of the tight oil formation in Chang-8 reservoir of Fu County in Ordos Basin. Fine sandstone in Chang-8 reservoir contained the movable tight oil with low density and low viscosity, and mostly concentrated in micron-sized pore throats. The accumulation of tight oil was mainly controlled by three factors that were the source rocks of Chang-7 and Chang-9 reservoirs, the main accumulation mode of "the reservoir existed in the resource, and the resource existed in the reservoir", and the high quality reservoir with composite superimposed sedimentary sand body formed in the underwater distributary channel microfacies environment. Based on the controlling factors above, and combined with the current exploration results, we predicted 6 potential blocks of Chang-8 tight oil reservoir in Fu County, and provided the basis for the further exploration.

Key words: controlling factors of reservoir formation, tight oil, Chang-8 reservoir, Fu County, Ordos Basin

CLC Number:

P512

Xiuchan Liu,Xipan Chen. Analysis on main controlling factors of tight oil reservoirs in Chang-8 reservoir of Fu County, Ordos Basin[J]. Reservoir Evaluation and Development, 2019, 9(1): 1-7.

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References 20

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井号	层位	油藏中深/ m	地层压力/MPa	油层温度/ ℃	饱和压力/ MPa	气油比/(m³·m^-3)	气体平均溶解系数/ (m³·m^-3·MPa^-1)	体积系数	收缩率, %	原油密度 /(g·cm^-3)	黏度/ （mPa·s）
L197	长8¹	1 535	6.617	60.46	5.809	47.88	8.242	1.232	18.83	0.738 9	0.983
FX45	长8²	1 333	4.650	53.12	3.539	18.48	5.248	1.095	8.29	0.801 4	6.810
L77	长8²	1 435	5.685	56.64	2.531	20.35	8.069	1.102	8.35	0.802 3	4.385
FX325	长8²	1 421	10.045	56.05	4.242	42.78	9.173	1.139	14.48	0.781 1	2.722
L147	长8²	1 515	8.292	60.92	5.494	45.42	8.267	1.220	18.04	0.738 8	0.954
LP163	长8²	1 675	3.000	54.14	2.630	43.26	19.240	1.126	11.02	0.742 0
平均		1 486	6.382	56.89	4.041	36.36	9.707	1.152	13.17	0.767 4	3.171

特征参数	孔隙度,%	渗透率/10^-3μm²	排驱压力/MPa	中值压力/MPa	中值半径/μm	平均喉道半径/μm	分选系数	退汞率,%
最小值	3.1	0.01	0.30	3.59	0.01	0.01	0.06	19.74
最大值	15.0	2.62	22.13	58.05	0.20	0.55	1.96	43.67
平均值	10.1	0.32	4.69	15.20	0.05	0.12	0.92	29.06

Analysis on main controlling factors of tight oil reservoirs in Chang-8 reservoir of Fu County, Ordos Basin

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